''HE was an astronaut on the second manned mission to the moon and the fourth man to walk on its surface.

Alan Bean, 85, is one of only 12 people to have taken “one small step for man and one giant leap for mankind” on the moon.

The lunar module pilot was one of two crew members on-board Apollo 12 who walked on the moon days after it launched on November 14, 1969.

The crew’s primary mission objectives included an extensive series of lunar exploration tasks by the lunar module and the deployment of the Apollo Lunar Surface Experiments Package to be left on the moon’s surface to gather seismic, scientific and engineering data.

Mr Bean has logged 1,671 hours and 45 minutes in space — 10 hours and 26 minutes of that were spent on the moon and in Earth’s orbit.

His experiences in space have led Mr Bean to develop some interesting theories about the possibility of alien life.

“I do not believe that anyone from outer space has ever visited the Earth,” Mr Bean told news.com.au from his home in Houston, Texas.

“One of reasons I don’t believe they have been here is that civilisations that are more advanced are more altruistic and friendly — like Earth, which is better than it used to be — so they would have landed and said ‘we come in peace and we know from our studies you have cancer that kills people, we solved that problem 50 years ago, here’s the gadget we put on a person’s chest that will cure it, we will show you how to make it’.

“Just like some day, say 1000 years from now, when we can go to another star and see a planet, that’s what we would do because we will know how to cure cancer, cure birth defects, so we would teach them.”

Mr Bean doesn’t doubt for a second that we are not alone.

“There’s so many billions of stars and these stars have planets around them so there must be statistically many planets around many stars that have formed life,” he said.

“Maybe some of them are like our life was 100,000 years ago, and some of them are like we are now, and there are probably some out there that are a 10,000 years in the future from where we are now.”

Mr Bean resigned from NASA in 1981 to become an artist. In his paintings he depicts the experiences of astronauts, including himself, who have walked on the moon. It’s a small club but it’s also one that he draws never-ending inspiration from.

“Even if I lived to 185 years old I wouldn’t run out of ideas of things to paint on this topic,” he said.

He uses textured and lunar tools, “sprinkled with bits of Apollo spacecraft and a touch of moon dust” to create his masterpieces, which sell for tens or hundreds of thousands of US dollars each via his website